EETC Wiring & Installation Techniques 5

Question 1

When connecting a 3-phase motor, swapping any two of the three phase leads will:

Accepted Answer

Reverse the direction of motor rotation

Answer

Swapping any two phase conductors on a 3-phase motor reverses the rotating magnetic field, causing the motor shaft to spin in the opposite direction.

Question 2

What is the correct procedure when installing a new circuit breaker in a live panel?

Accepted Answer

Wear insulated gloves and use insulated tools with the main breaker off if possible

Answer

Safe work practice requires insulated PPE and tools; turning off the main breaker eliminates shock risk from bus bars during breaker installation.

Question 3

A GFCI receptacle's 'Load' terminals protect:

Accepted Answer

Receptacles wired downstream on the same circuit

Answer

Devices connected to the LOAD terminals of a GFCI receptacle receive GFCI protection, extending protection to downstream outlets.

Question 4

When installing conduit in a concrete pour, which type should be used?

Accepted Answer

PVC Schedule 40 or 80

Answer

PVC Schedule 40 or 80 conduit is used in concrete encasement because it resists corrosion from the alkaline concrete environment.

Question 5

The ampacity of a conductor must be derated when more than three current-carrying conductors are bundled together because:

Accepted Answer

Heat accumulates and cannot dissipate as effectively

Answer

Bundled conductors share heat that cannot dissipate as quickly, reducing each conductor's safe current-carrying capacity.

(EETC) Electrical Technician Certification Practice Test